nehcsivart

Not a diagram, but here is an informational video by Clustrix: https://www.youtube.com/watch?v=PUq1fYZlNPs

The video is from almost 5 years ago, but the high level idea discussed is still true today.

The problem with opening multiple terminals is that you will eventually be slowed down in your workflow. Say you want to switch to a particular terminal, and you have more than 10 terminals running. You either have to press CTRL+Tab a few times (5 times on average for 10 terminals), or switch using the mouse, both of which are slow.

Another problem is working remotely. If you connect to a remote server, and you need another terminal for that remote server, you must establish another separate connection. With a terminal multiplexer, you do not need that.

As is with many things, the business decisions that makes sense usually overwrites the technical decisions that makes sense.